When an increase in plant size shifts the ATC curve down and to the right, we know production involves:

1. . Constant Economies of Scale.
2. . Economies of Scale.
3. . Dis-economies of Scale.
4. . none of the above

When an increase in plant size shifts the ATC curve up and to the right we know production involves:

1. . Constant Economies of Scale.
2. . Economies of Scale.
3. . Dis-economies of Scale.
4. . None of the above.

When an increase in plant size causes ATC to shift horizontally to the right, we know production involves:

1. Constant Economies of Scale.
2. Economies of Scale
3. Dis-economies of Scale.
4. Not enough information.